Mick
Let's discuss neighbors and towns.
Assume for a moment that we establish colonies on other planets. New towns. Also consider that the cost of transportation is such that regular communication between towns is limited (for example, it might be limited by time dilation if the colonies are far enough apart)
Would humans under such condition speciate? Would we find that 100-1000 generations down the road the folk living around star A are a different species than those around star B?
Aslan is not a Tame Lion